Using the Building Model Add-on in RFEM 6 to display Story Actions, Interstory Drifts, and Forces in Shear Walls

Technical Article on the Topic Structural Analysis Using Dlubal Software

  • Knowledge Base

Technical Article

In RFEM 6, seismic analysis can be done by using the Modal Analysis and the Response Spectrum Analysis add-ons. Once the spectral analysis has been performed, it is possible to use the Building Model add-on to display story actions, interstory drifts, and forces in shear walls.

The general concept of seismic analysis is based on the creation of a load case for the modal analysis and for the response spectrum analysis. A load case of the modal analysis type is required to obtain the natural vibration values. This load case is then imported into a response spectrum analysis load case where a response spectrum can be assigned and the modes of interest can be selected. The detailed workflow is discussed in the Knowledge Base article titled “Seismic Analysis in RFEM 6”.

Assuming that the seismic design according to the response spectrum analysis has been performed, RFEM 6 provides the option to use the Building Model add-on to display story actions, interstory drifts, and forces in shear walls. This can be used for further analysis (e.g., for the direction of the pushover analysis) or considered in terms of calculation according to the second-order theory.

To do so, it is necessary to activate the Building Model add-on in the Base Data of the model and define the building stories. The example provided in this article is a six-story building (Image 1). The story height is 4 m for each floor. Hence, it is enough to create the first story and copy it 6 times, as shown in Image 2.

Once the building stories have been defined, the spectral analysis results can be displayed by story (Images 3 to 5). First, the story actions obtained from the earthquake calculation can be listed in the table, as shown in Image 3. The centroid coordinates are also displayed. In a similar manner, the interstory drifts are available as shown in Image 4. 

When displaying results by story, the program creates result sections for each shear wall on each of the building stories (Image 5). Hence, total forces, as well as forces per unit length, are available in the Results table. These values can be used directly for the shear design of the separate shear walls. 

Author

Irena Kirova, M.Sc.

Irena Kirova, M.Sc.

Marketing & Customer Support

Ms. Kirova is responsible for creating technical articles and provides technical support to the Dlubal customers.

Keywords

Building Model Spectral Analysis Story Actions Interstory Drifts Shear Walls

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  • Updated 9 February 2022

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RFEM 6
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The structural analysis program RFEM 6 is the basis of a modular software system. The main program RFEM 6 is used to define structures, materials, and loads of planar and spatial structural systems consisting of plates, walls, shells, and members. The program can also design combined structures as well as solid and contact elements.

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